Verify the algebraic identities by paper cutting and pasting method ( + )2 = 2 + 2 + 2 ( − )2 = 2 + 2 − 2
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Step-by-step explanation:
Area of the square PQRS on the white sheet paper.
(a+b)2 = (4+2)2 = 6 x 6 = 36 sq. units ……….(i)
Area of two coloured squares I and II
area of Ist square = a2 = 42 = 16 sq.units
area of IInd square = b2 = 22 = 4 sq.units
Area of two coloured rectangles III and IV = 2(a x b) = 2(4 x 2) = 16 sq. units
Now, total area of four quadrilaterals (calculated)
= a2 + b2 + 2(ab)
= 16+4+16
= 36 sq. units ……….(ii)
Area of square ABCD = Total area of four quadrilaterals = 36 sq. units
Equating (i) and (ii)
Area of square PQRS = Area of square ABCD
i.e., (a+b)2 = a2 + b2 + 2ab
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